Moves bookmarks related files into app folder

[NejcZdovc]

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

Resolves #8351

What was done

1. moved files from js to app folder
2. split components to a single file per component principle

Auditors

@bsclifton @cezaraugusto

Test Plan

• test should be green

[bsclifton]

++